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<p>Provides undo and redo support for a document.</p>
<h2>Package Specification</h2>
<p>When an <tt>IDocumentUndoManager</tt> is connected to an <tt>IDocument</tt>, 
  any change to the document is recorded and can then be undone and redone later. 
  Clients which are interested in undo/redo events can register an <tt>IDocumentUndoistener</tt>
  with the <tt>IDocumentUndoManager</tt>.</p>
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